_validutf8.c - scc - simple c99 compiler
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       ---
       _validutf8.c (552B)
       ---
            1 #include <wchar.h>
            2 
            3 #include "../libc.h"
            4 
            5 struct range {
            6         unsigned long begin, end;
            7         int valid;
            8         int nbytes;
            9 };
           10 
           11 int
           12 _validutf8(wchar_t wc, int *nbytes)
           13 {
           14 
           15         static struct range ranges[] = {
           16                 {0,         0x80,       1, 1},
           17                 {0x80,      0x800,      1, 2},
           18                 {0x800,     0xD800,     1, 3},
           19                 {0xD800,    0xDD00,     0, 3},
           20                 {0xDD00,    0x10000,    1, 3},
           21                 {0x10000,   0x110000,   1, 4},
           22                 {0x110000,  -1ul,       0, 0},
           23         };
           24         struct range *bp;
           25 
           26         for (bp = ranges; bp->begin > wc || bp->end <= wc; ++bp)
           27                 ;
           28         *nbytes = bp->nbytes;
           29 
           30         return bp->valid;
           31 }